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What is this formula related to in physics fluid mechanics ?

What is this formula related to in physics fluid mechanics ?

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1 Answers

Sahani Kumar
99 Points
5 years ago
This formula is related to Rate of flow of liquid in a tube. 
V' and  V represent the rate of the flow of liquid in two different condition. 
P= pressure difference
r= radius of the tube    l = length of the tube. 
n= coefficient of viscosity(represented by eta)
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